<template>
  <div class="star" :class="starType">
    <span class="star-item" v-for="(itemClass,index) in itemClasses" :class="itemClass" :key="index">
    </span>
  </div>
</template>
<script type="text/ecmascript-6">
const LENGTH = 5;
const CLS_ON = 'on';
const CLS_HALF = 'half';
const CLS_OFF = 'off';

export default {
  props: {
    size: {
      type: Number
    },
    score: {
      type: Number
    }
  },
  computed: {
    starType() {
      return 'star-' + this.size;
    },
    itemClasses() {
      let result = [];
      let score = Math.floor(this.score * 2) / 2;
      let hasDecimal = score % 1 !== 0;
      let integer = Math.floor(score);
      for (let i = 0; i < integer; i++) {
        result.push(CLS_ON);
      }
      if (hasDecimal) {
        result.push(CLS_HALF);
      }
      while (result.length < LENGTH) {
        result.push(CLS_OFF);
      }
      return result;
    }
  }
};

</script>
<style lang="scss" scoped="" type="text/css">
@import "../../common/stylus/mixin";

  .star{
    font-size:0;
    .star-item{
      display: inline-block;
      background-repeat: no-repeat;
    }
    &.star-48{
      .star-item{
        width:20px;
        height:20px;
        margin-right:22px;
        background-size:100% 100%;
        &:last-chile{
          margin-right:0;
        }
        &.on{
          @include bg-image('star48_on');
        }
        &.half{
          @include bg-image('star48_half');
        }
        &.off{
          @include bg-image('star48_off');
        }
      }
    }
    &.star-36{
      .star-item{
        width:15px;
        height:15px;
        margin-right:6px;
        background-size:100% 100%;
        &:last-chile{
          margin-right:0;
        }
        &.on{
          @include bg-image('star36_on');
        }
        &.half{
          @include bg-image('star36_half');
        }
        &.off{
          @include bg-image('star36_off');
        }
      }
    }    &.star-24{
      .star-item{
        width:10px;
        height:10px;
        margin-right:3px;
        background-size:10px 10px;
        &:last-chile{
          margin-right:0;
        }
        &.on{
          @include bg-image('star24_on');
        }
        &.half{
          @include bg-image('star24_half');
        }
        &.off{
          @include bg-image('star24_off');
        }
      }
    }
  }
</style>
